When it comes to expressing a positive shift in one's demeanor, there are a variety of synonyms for the phrase "improved in mood." One such phrase is "set at ease," which suggests a feeling of relaxation and comfort. "Elevated spirits" and "lifted emotions" indicate a boost in energy or enthusiasm. "Enlightened mood" connotes a sense of increased understanding or awareness, while "reinvigorated outlook" implies a renewed sense of optimism. "Uplifted countenance" and "brightened demeanor" indicate a visible change in facial expression or body language. No matter the phrase you choose, communicating a positive change in mood can help uplift others around you.